Coex is a mall complex at Samsung station on line two. It's a huge maze of a place where you can find heaps of everything - restaurants, clothes shops, cinemas, bookshops, exhibitions.. There is even an aquarium that is quit nice, though I have seen better.

JY, MS and I had dinner at one of Coex's many restaurants after Salon du Chocolat, called Dasoban.
Seafood rice, Curry chicken noodles, and tofu salad. So filling.